An Account of Several Experiments concerning the Running of Water in Pipes, as It is Retarded by Friction and Intermixed Air, Some of Which Were Made before the Royal Society on Thursday the 5th of May, 1726. With a Description of a New Machine, Whereby Pipes May be Clear'd of Air, as the Water Runs Along, without Stand-Pipes, or the Help of Any Hand. By the Rev. J. T Desaguliers, LL. D. F. R. S.